A cellphone captured a deadly police shooting in Louisiana -- and another in Minnesota. But in the latter case, an eyewitness uploaded the video to Facebook Live while a young man lay dying next to her in the car.

In the video, you can hear the women state, "Please officer, don't tell me that you just did this to him. You just shot four bullets into him, sir. He was just getting his license and registration, sir."

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On Thursday, there was strong reaction from the faith-based community.

"Pain for our culture," said Les Simmons, assistant pastor at the South Sacramento Christian Center. Simmons said there was pain "from our faith community as well -- that our young African-American males and females are getting gunned down by those that are paid to protect and serve us.”

The cellphone camera has changed the rules of engagement between civilians and police.

"Things like this have been happening for years," said Danielle Williams, a community organizer from Sacramento Area Congregations Together. "There just wasn't a camera. Now, we have cellphones. Now, we have Facebook feeds-- where we can cover it."

Police are increasingly using body cams to document their interactions with the public to help promote transparency and trust.

"We go through a lot of de-escalation training, a tremendous amount, here," said Ralph Brown, an information officer with the Commission on Peace Officer Standards and Training in West Sacramento.

The commission works with law enforcement up and down the state, teaching officers how to be prepared for interactions with the public.

"The general rule of thumb is: Act like and do your business like somebody is videotaping you all the time," Brown said.

The use of cameras - and social media - to document interactions between the police and the public is now becoming the new normal.

"It shows the public what's really happening as opposed to written reports," said Kenneth Providence, an associate pastor at South Sacramento Christian Center.

"When it's live like that on camera, my grandfather says, ‘Two things don't lie: dead men and pictures,’" said Sistahpat Roundtree Rivers, co-pastor of His Glory Church in Sacramento.

Back in the 1960s when the civil rights movement took off, it was professional news crews that showed civil rights protesters getting hosed down by police in the South.

The footage was so powerful, many say it changed the course of history.

"What really changed Americans -- primarily Caucasian Americans -- is where they saw the kids who were attacked by dogs," Williams said. "And that started to change hearts and minds.”

Now, community activists are supporting the use of civilian cameras to change police conduct.

"If our leaders at the top of that chain will hold their staff accountable, then we can make headway on what's happening on the streets," Providence said.

Police said they welcome more transparency, but there are concerns about someone making a video to deliberately put them in a false light.

"That topic of conversation, right now, is taking place up and down the state," Brown said. "Right now, it's a hot topic of conversation."

But when it comes to interacting with the public, Brown has this advice for officers:

"What I would say to law enforcement in California is, ‘Keep doing the right thing and behave like you're always being video-recorded.’"